rsa_pss.c

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/* rsa_pss.c */
/* Written by Dr Stephen N Henson ([email protected]) for the OpenSSL
 * project 2005.
 */
/* ====================================================================
 * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    [email protected].
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/sha.h>

static const unsigned char zeroes[] = {0,0,0,0,0,0,0,0};

#if defined(_MSC_VER) && defined(_ARM_)
#pragma optimize("g", off)
#endif

int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash,
            const EVP_MD *Hash, const unsigned char *EM, int sLen)
    {
    return RSA_verify_PKCS1_PSS_mgf1(rsa, mHash, Hash, NULL, EM, sLen);
    }

int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash,
            const EVP_MD *Hash, const EVP_MD *mgf1Hash,
            const unsigned char *EM, int sLen)
    {
    int i;
    int ret = 0;
    int hLen, maskedDBLen, MSBits, emLen;
    const unsigned char *H;
    unsigned char *DB = NULL;
    EVP_MD_CTX ctx;
    unsigned char H_[EVP_MAX_MD_SIZE];
    EVP_MD_CTX_init(&ctx);

    if (mgf1Hash == NULL)
        mgf1Hash = Hash;

    hLen = EVP_MD_size(Hash);
    if (hLen < 0)
        goto err;
    /*
     * Negative sLen has special meanings:
     *  -1  sLen == hLen
     *  -2  salt length is autorecovered from signature
     *  -N  reserved
     */
    if      (sLen == -1)    sLen = hLen;
    else if (sLen == -2)    sLen = -2;
    else if (sLen < -2)
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
        goto err;
        }

    MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
    emLen = RSA_size(rsa);
    if (EM[0] & (0xFF << MSBits))
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_FIRST_OCTET_INVALID);
        goto err;
        }
    if (MSBits == 0)
        {
        EM++;
        emLen--;
        }
    if (emLen < (hLen + sLen + 2)) /* sLen can be small negative */
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE);
        goto err;
        }
    if (EM[emLen - 1] != 0xbc)
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_LAST_OCTET_INVALID);
        goto err;
        }
    maskedDBLen = emLen - hLen - 1;
    H = EM + maskedDBLen;
    DB = OPENSSL_malloc(maskedDBLen);
    if (!DB)
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, ERR_R_MALLOC_FAILURE);
        goto err;
        }
    if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0)
        goto err;
    for (i = 0; i < maskedDBLen; i++)
        DB[i] ^= EM[i];
    if (MSBits)
        DB[0] &= 0xFF >> (8 - MSBits);
    for (i = 0; DB[i] == 0 && i < (maskedDBLen-1); i++) ;
    if (DB[i++] != 0x1)
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_RECOVERY_FAILED);
        goto err;
        }
    if (sLen >= 0 && (maskedDBLen - i) != sLen)
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
        goto err;
        }
    if (!EVP_DigestInit_ex(&ctx, Hash, NULL)
        || !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes)
        || !EVP_DigestUpdate(&ctx, mHash, hLen))
        goto err;
    if (maskedDBLen - i)
        {
        if (!EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i))
            goto err;
        }
    if (!EVP_DigestFinal_ex(&ctx, H_, NULL))
        goto err;
    if (memcmp(H_, H, hLen))
        {
        RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_BAD_SIGNATURE);
        ret = 0;
        }
    else 
        ret = 1;

    err:
    if (DB)
        OPENSSL_free(DB);
    EVP_MD_CTX_cleanup(&ctx);

    return ret;

    }

int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM,
            const unsigned char *mHash,
            const EVP_MD *Hash, int sLen)
    {
    return RSA_padding_add_PKCS1_PSS_mgf1(rsa, EM, mHash, Hash, NULL, sLen);
    }

int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM,
            const unsigned char *mHash,
            const EVP_MD *Hash, const EVP_MD *mgf1Hash, int sLen)
    {
    int i;
    int ret = 0;
    int hLen, maskedDBLen, MSBits, emLen;
    unsigned char *H, *salt = NULL, *p;
    EVP_MD_CTX ctx;

    if (mgf1Hash == NULL)
        mgf1Hash = Hash;

    hLen = EVP_MD_size(Hash);
    if (hLen < 0)
        goto err;
    /*
     * Negative sLen has special meanings:
     *  -1  sLen == hLen
     *  -2  salt length is maximized
     *  -N  reserved
     */
    if      (sLen == -1)    sLen = hLen;
    else if (sLen == -2)    sLen = -2;
    else if (sLen < -2)
        {
        RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
        goto err;
        }

    MSBits = (BN_num_bits(rsa->n) - 1) & 0x7;
    emLen = RSA_size(rsa);
    if (MSBits == 0)
        {
        *EM++ = 0;
        emLen--;
        }
    if (sLen == -2)
        {
        sLen = emLen - hLen - 2;
        }
    else if (emLen < (hLen + sLen + 2))
        {
        RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
        goto err;
        }
    if (sLen > 0)
        {
        salt = OPENSSL_malloc(sLen);
        if (!salt)
            {
            RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1,ERR_R_MALLOC_FAILURE);
            goto err;
            }
        if (RAND_bytes(salt, sLen) <= 0)
            goto err;
        }
    maskedDBLen = emLen - hLen - 1;
    H = EM + maskedDBLen;
    EVP_MD_CTX_init(&ctx);
    if (!EVP_DigestInit_ex(&ctx, Hash, NULL)
        || !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes)
        || !EVP_DigestUpdate(&ctx, mHash, hLen))
        goto err;
    if (sLen && !EVP_DigestUpdate(&ctx, salt, sLen))
        goto err;
    if (!EVP_DigestFinal_ex(&ctx, H, NULL))
        goto err;
    EVP_MD_CTX_cleanup(&ctx);

    /* Generate dbMask in place then perform XOR on it */
    if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash))
        goto err;

    p = EM;

    /* Initial PS XORs with all zeroes which is a NOP so just update
     * pointer. Note from a test above this value is guaranteed to
     * be non-negative.
     */
    p += emLen - sLen - hLen - 2;
    *p++ ^= 0x1;
    if (sLen > 0)
        {
        for (i = 0; i < sLen; i++)
            *p++ ^= salt[i];
        }
    if (MSBits)
        EM[0] &= 0xFF >> (8 - MSBits);

    /* H is already in place so just set final 0xbc */

    EM[emLen - 1] = 0xbc;

    ret = 1;

    err:
    if (salt)
        OPENSSL_free(salt);

    return ret;

    }

#if defined(_MSC_VER)
#pragma optimize("",on)
#endif